Coffee, a hot drink made from the roasted beans (seeds) of the coffee tree. Coffee is a popular beverage in North America, commonly consumed at breakfast or during the morning "coffee break" at work. It contains 1 to 2 per cent caffeine, a substance that stimulates the central nervous system. Caffeine increases wakefulness and alertness, but excessive amounts can cause a number of unpleasant symptoms. Persons who regularly drink more than five cups of coffee daily may experience withdrawal symptoms if they stop drinking it.
Thinking allows us to solve problems, plan ahead and defend ourselves from outside threats. It's what separates us from "lower" life-forms like plants, right? Well, maybe not.
Though they may be stuck in one place, plants have proven to possess a surprising array of capabilities. But the ability to feel pain? Scientists are learning that the possibility isn't as crazy as it sounds.